Experimental investigations on the formation of excess air in quasi-saturated porous media

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2002
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Holocher, Johannes
Aeschbach-Hertig, Werner
Hofer, Markus
Brennwald, Matthias S.
Kinzelbach, Wolfgang
Kipfer, Rolf
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Geochimica et Cosmochimica Acta. 2002, 66(23), pp. 4103-4117. ISSN 0016-7037. Available under: doi: 10.1016/S0016-7037(02)00992-4
Zusammenfassung

The formation of an excess of dissolved gas ( excess air ) in quasi-saturated media was studied by analyzing and interpreting dissolved noble gas concentrations in laboratory column experiments. Using quartz sand filled columns of 1 m length, two different experimental designs were realized. In the first, groundwater recharge was simulated by a unidirectional vertical water flow through the columns. In the second, groundwater level fluctuations in an aquifer zone without active infiltration were reproduced by cyclic water level fluctuations in the columns. The reproducible generation of excess air under these defined, near natural conditions was successful. Partial or complete dissolution of air bubbles entrapped in the quartz sand could be identified as the mechanism responsible for the generation of excess air. Depending on the experimental design, supersaturation of the dissolved atmospheric noble gases ranging between 1.4% ∆Ne and 16.2% ∆Ne was found. The measured noble gas patterns were interpreted using inverse modeling and conceptual gas exchange models and were compared to results of numerical simulations of gas bubble dissolution in water filled soil columns. The gas composition in most of the samples resembles either unfractionated pure atmospheric excess air or is fractionated in accordance with closed-system equilibration between entrapped air and surrounding water. In addition to the amount of entrapped air, the hydrostatic pressure exerted on the entrapped air bubbles is the dominating parameter responsible for the total amount of dissolved air. The composition of the excess air component is controlled by the water flow regime, the bubble size distribution, the initially dissolved gas concentrations and the initially entrapped gas composition.

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570 Biowissenschaften, Biologie
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excess air, quasi-saturated porous media, quartz sand, noble gases, dissolved gas concentrations
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ISO 690HOLOCHER, Johannes, Frank PEETERS, Werner AESCHBACH-HERTIG, Markus HOFER, Matthias S. BRENNWALD, Wolfgang KINZELBACH, Rolf KIPFER, 2002. Experimental investigations on the formation of excess air in quasi-saturated porous media. In: Geochimica et Cosmochimica Acta. 2002, 66(23), pp. 4103-4117. ISSN 0016-7037. Available under: doi: 10.1016/S0016-7037(02)00992-4
BibTex
@article{Holocher2002Exper-8543,
  year={2002},
  doi={10.1016/S0016-7037(02)00992-4},
  title={Experimental investigations on the formation of excess air in quasi-saturated porous media},
  number={23},
  volume={66},
  issn={0016-7037},
  journal={Geochimica et Cosmochimica Acta},
  pages={4103--4117},
  author={Holocher, Johannes and Peeters, Frank and Aeschbach-Hertig, Werner and Hofer, Markus and Brennwald, Matthias S. and Kinzelbach, Wolfgang and Kipfer, Rolf}
}
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    <dcterms:abstract xml:lang="eng">The formation of an excess of dissolved gas ( excess air ) in quasi-saturated media was studied by analyzing and interpreting dissolved noble gas concentrations in laboratory column experiments. Using quartz sand filled columns of 1 m length, two different experimental designs were realized. In the first, groundwater recharge was simulated by a unidirectional vertical water flow through the columns. In the second, groundwater level fluctuations in an aquifer zone without active infiltration were reproduced by cyclic water level fluctuations in the columns. The reproducible generation of excess air under these defined, near natural conditions was successful. Partial or complete dissolution of air bubbles entrapped in the quartz sand could be identified as the mechanism responsible for the generation of excess air. Depending on the experimental design, supersaturation of the dissolved atmospheric noble gases ranging between 1.4% ∆Ne and 16.2% ∆Ne was found. The measured noble gas patterns were interpreted using inverse modeling and conceptual gas exchange models and were compared to results of numerical simulations of gas bubble dissolution in water filled soil columns. The gas composition in most of the samples resembles either unfractionated pure atmospheric excess air or is fractionated in accordance with closed-system equilibration between entrapped air and surrounding water. In addition to the amount of entrapped air, the hydrostatic pressure exerted on the entrapped air bubbles is the dominating parameter responsible for the total amount of dissolved air. The composition of the excess air component is controlled by the water flow regime, the bubble size distribution, the initially dissolved gas concentrations and the initially entrapped gas composition.</dcterms:abstract>
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